Rain gutter system

Abstract

To provide a trough system, particularly a large trough system with a reduced diameter part, which can more reliably produce a siphon phenomenon and stably propagate the produced siphon phenomenon to an upstream portion.SOLUTION: A trough system 1 comprises an eaves gutter 10, a downspout 45, a connection joint 35 disposed downstream of the eaves gutter and connected to an upper end part of the downspout, and a siphon joint 50 having a reduced diameter part and disposed on the downspout. A flow channel cross section S of the eaves gutter is 11000 mm2 or more. An inner diameter of the downspout is 65 mm or more. A length L7 of the downspout located between the connection joint and the siphon joint is 1 m or more.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rain gutter system. [Background technology]

[0002] Conventionally, it is known that a siphoning phenomenon occurs in a rain gutter system in which a downspout is provided with a reduced diameter section (see, for example, Patent Document 1). In this rain gutter system, rainwater (water) is stored in the reduced diameter section. Then, the siphoning phenomenon occurs due to gravity acting on the stored rainwater. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-144870 A Summary of the Invention [Problem to be solved by the invention]

[0004] The gutter system of Patent Document 1 is a small-sized gutter system used in houses, etc. Meanwhile, large-sized gutter systems to be used in logistics warehouses, factories, etc. are being considered. In this type of gutter system, it is necessary to increase the flow cross-sectional area of ​​the eaves gutter and the inner diameter of the downspout in accordance with the flow rate of the discharged rainwater. However, when there is an elbow (connection joint) between the eaves gutter and the narrowed section, there are cases where the siphoning phenomenon does not occur at the narrowed section, or where the siphoning phenomenon that occurs at the narrowed section does not reach the upstream eaves gutter where the rainwater flows. In such cases, rainwater that is not drained from the eaves gutter to the narrowed section accumulates, and there is a risk of the rainwater overflowing from the eaves gutter.

[0005] The present invention has been made in consideration of such problems, and aims to provide a gutter system that can more reliably cause siphonage, even in a large gutter system equipped with a reduced diameter section, and can stably transmit the generated siphonage to the upstream section. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. The gutter system of the present invention comprises an eaves gutter, a downspout, a connection joint arranged downstream of the eaves gutter and connected to the upper end of the downspout, and a siphon joint having a reduced diameter portion and provided on the downspout, and the flow path cross-sectional area of ​​the eaves gutter is 11,000 mm 2 The above is characterized in that the inner diameter of the downspout is 65 mm or more, and the length of the downspout located between the connection joint and the siphon joint is 1 m or more. The flow path cross-sectional area of ​​the eaves gutter referred to here means the cross-sectional area through which rainwater can flow within the eaves gutter when viewed along the longitudinal direction of the eaves gutter.

[0007] According to this invention, the cross-sectional area of ​​the eaves gutter is 11,000 mm 2 and the inner diameter of the downspout is 65 mm or more. Therefore, the downspout system can be used as a large-scale downspout system for use in a logistics warehouse or the like. Since the siphon joint provided in the downspout has a reduced diameter section, the flow rate of rainwater flowing into the reduced diameter section is greater than the flow rate of rainwater flowing out downstream from the reduced diameter section. Therefore, rainwater is likely to accumulate in the reduced diameter section. When rainwater accumulates in the reduced diameter section, the downspout arranged downstream of the reduced diameter section becomes full. Then, the rainwater in the reduced diameter section is pulled by the rainwater in the downspout arranged downstream of the reduced diameter section, causing a siphon phenomenon, and the rainwater in the downspout system flows downstream with force. In this case, the inventors of the present application discovered that if the length of the downspout located between the connection joint and the siphon joint is 1 m or more, the siphon effect can be more reliably generated in the siphon joint having a reduced diameter portion, and the siphon effect generated in the siphon joint can be stably transmitted to the upstream part of the gutter system. Therefore, even in a large gutter system equipped with a reduced diameter section, the siphoning effect can be more reliably generated and the generated siphoning effect can be stably transmitted to the upstream portion.

[0008] In the gutter system, a radius of curvature of an inner wall surface on an inner periphery side of the connection joint may be greater than 64 mm and smaller than 125 mm in a cross section including an axis of the connection joint. According to this invention, rainwater that flows into the connection joint from one end in the direction along the axis of the connection joint does not stagnate on the inner wall surface on the inner periphery of the connection joint, and the flow rate of the rainwater is unlikely to decrease on the inner wall surface. Therefore, the rainwater that flows into the connection joint can flow smoothly toward the other end in the direction along the axis of the connection joint.

[0009] In the gutter system, the angle between the axes of the connection parts provided at both ends of the connection joint may be 45° or less. The angle between the axes of the connecting parts referred to here means the more acute angle between the two axes. According to this invention, rainwater that flows into the connection joint from one connection part of the connection joint does not stagnate within the connection joint, and the flow rate of the rainwater within the connection joint is unlikely to decrease. Therefore, the rainwater that flows into the connection joint can flow smoothly toward the other connection part of the connection joint.

[0010] The gutter system may also include a lower gutter connected to the downstream side of the eaves gutter and connected to the downpipe, the length of the lower gutter being 3 m or less, and the angle between the axis of the lower gutter and the axis of the downpipe being 45° or less. The angle between the axis of the downspout and the axis of the downspout here refers to the more acute angle between the two axes. According to the present invention, the flow rate of rainwater discharged from the gutter system per unit time can be increased.

[0011] The gutter system may also include an underground buried pipe connected to the downstream end of the downspout, and an expanded diameter section provided in the downspout between the siphon joint and the underground buried pipe. According to this invention, the rainwater is put under negative pressure in the enlarged diameter section, so that the flow rate of the rainwater in the portion of the downspout upstream of the enlarged diameter section can be further increased, thereby further increasing the flow rate of the rainwater flowing through the gutter system. Effect of the Invention

[0012] According to the gutter system of the present invention, even in a large gutter system equipped with a reduced diameter section, the siphoning effect can be more reliably generated and the generated siphoning effect can be stably transmitted to the upstream portion. [Brief description of the drawings]

[0013] [Figure 1] 1 is a side view, with a portion cut away, of a gutter system according to a first embodiment of the present invention. FIG. [Diagram 2] FIG. 4 is a vertical cross-sectional view of a second connection joint of the gutter system. [Diagram 3] FIG. 2 is a vertical cross-sectional view of a siphon joint of the rain gutter system. [Figure 4] FIG. 2 is a side view, with a portion cut away, of a gutter system in a modified example of the first embodiment of the present invention. [Diagram 5] FIG. 5 is a partially cutaway side view of a gutter system according to a second embodiment of the present invention. [Figure 6] FIG. 2 is a vertical cross-sectional view of a siphon joint of a gutter system according to a first modified example of the present invention. [Figure 7] FIG. 2 is an enlarged view of a siphon joint of the gutter system. [Figure 8] FIG. 11 is a vertical cross-sectional view of a siphon joint of a gutter system according to a second modified example of the present invention. [Figure 9] FIG. 2 is an enlarged view of a siphon joint of the gutter system. [Figure 10] FIG. 11 is a partially cutaway side view of a gutter system according to a third modified example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] (First embodiment) Hereinafter, a first embodiment of a gutter system according to the present invention will be described with reference to Figs. 1 to 4. As shown in FIG. 1, a rain gutter system 1 of this embodiment is a large rain gutter system used in a building 200 such as a logistics warehouse. The gutter system 1 includes an eaves gutter 10, a first connection joint 20, a call gutter 30, a second connection joint (connection joint) 35, a downspout 45, and a siphon joint 50. The eaves gutter 10 is disposed under the eaves of the building 200. That is, the eaves gutter 10 is disposed below the edge 201a of the roof 201 of the building 200. The eaves gutter 10 extends in a first direction X along the edge 201a of the roof 201. In FIG. 1, the eaves gutter 10 is cut in a direction perpendicular to the first direction X. For example, the first direction X is a direction along a horizontal plane. The eaves gutter 10 is formed in a U-shape that opens upward. The eaves gutter 10 includes a bottom wall 11, a first side wall 12, and a second side wall 13.

[0015] The bottom wall 11 is formed in a plate shape with the thickness direction being the vertical direction Z. The upper surface of the bottom wall 11 is the bottom surface 11a of the eaves gutter 10. An opening 11b penetrating the bottom wall 11 in the vertical direction Z is formed in the bottom surface 11a of the bottom wall 11. For example, the opening 11b has a circular shape in a plan view. The opening 11b may have a rectangular shape or the like in a plan view. The width direction of the bottom wall 11 is a second direction Y that is perpendicular to the first direction X and the vertical direction Z.

[0016] The first side wall 12 rises upward from an end (first end) of the bottom wall 11 on a first side in the second direction Y. The first side wall 12 is arranged so as to gradually incline toward the first side in the second direction Y as it extends upward. The second side wall 13 rises upward from an end (second end) of the bottom wall 11 on a second side opposite the first side in the second direction Y. The second side wall 13 is arranged so as to gradually incline toward the second side in the second direction Y as it extends upward. For example, the eaves gutter 10 is formed by bending a polyvinyl chloride steel plate or the like. In this example, the upper end of the first side wall 12 is disposed higher than the upper end of the second side wall 13. The eaves gutter 10 in this example is a so-called high front gutter. The first side wall 12 is disposed on a first side in the second direction Y of the end 201a of the roof 201 when viewed in the vertical direction Z. The second side wall 13 is disposed on a second side in the second direction Y of the end 201a of the roof 201 when viewed in the vertical direction Z.

[0017] The flow path cross-sectional area of ​​the eaves gutter 10 means the cross-sectional area through which rainwater can flow within the eaves gutter 10 when viewed along the longitudinal direction (first direction X) of the eaves gutter 10. Here, a reference line L1 is defined that passes through the upper end of the second side wall 13 and is along a horizontal plane. When rainwater flows upward beyond the reference line L1 within the eaves gutter 10, it overflows to the outside from the second side wall 13. The flow path cross-sectional area S means the area enclosed by the bottom wall 11, the first side wall 12, the second side wall 13, and the reference line L1. The cross-sectional area of ​​the flow passage is 11000 mm 2 That's all. The flow path cross-sectional area S is 29000 mm 2 It is preferable that the length is 40,000 mm or more. 2 More preferably, it is equal to or greater than this.

[0018] The eaves gutter 10 is fixed to the building 200 by a fixing device (not shown). The eaves gutter 10 is preferably disposed so as to have an appropriate water gradient with respect to a horizontal plane. The eaves gutter may be a so-called parallel gutter in which the position of the upper end of the first side wall in the vertical direction Z is equal to the position of the upper end of the second side wall in the vertical direction Z. When the eaves gutter is a parallel gutter, the flow path cross-sectional area S means the area enclosed by a reference line that passes through the bottom wall, the first side wall, the second side wall, and the upper ends of each side wall and is aligned along a horizontal plane.

[0019] The first connection joint 20 includes a curved pipe portion 21, a first connection portion 22, and a second connection portion . In a cross section including the axis of the curved pipe portion 21, the central angle of the curved pipe portion 21 is approximately 45°. The first connection portion 22 is disposed at a first end portion in the axial direction of the curved pipe portion 21. The first connection portion 22 is connected to the peripheral portion of the opening 11b in the eaves gutter 10. The second connection portion 23 is a socket. The inner diameter of the second connection portion 23 is larger than the inner diameter of the curved pipe portion 21. The second connection portion 23 is disposed at a second end portion of the curved pipe portion 21 opposite to the first end portion in the axial direction. In the first connection joint, the second connection portion may be a plug.

[0020] The outlet pipe 30 is formed in a straight pipe shape. A first end of the call gutter 30 is inserted into the second connection part 23 of the first connection joint 20. The second connection part 23 and the call gutter 30 are maintained watertight. The call gutter 30 is connected to the downstream side of the eaves gutter 10, through which rainwater flows. The first connection joint 20 connects the eaves gutter 10 and the call gutter 30. That is, the call gutter 30 is connected to the downstream side of the eaves gutter 10. The length of the nominal pipe 30 is 3 m or less. The length of the nominal pipe 30 here means the length of the portion of the nominal pipe 30 that is not covered by the socket. In this example, it means a length L6 obtained by subtracting the length of the nominal pipe 30 covered by the second connection part 23 of the first connection joint 20, which is the socket, and the first connection part 37 of the second connection joint 35, which will be described later, from the actual length of the nominal pipe 30. It is more preferable that the length L6 of the call down pipe 30 is 2 m or less. There is no particular lower limit to the length L6, and the end of the second connection part 23 of the first connection joint 20 and the end of the first connection part 37 of the second connection joint 35 may be in contact with each other. In this case, the call down pipe 30 is long enough to be hidden by the second connection part 23 and the first connection part 37.

[0021] 1 and 2, the second connection joint 35 includes a curved pipe portion 36, a first connection portion (connection portion) 37, and a second connection portion (connection portion) 38. Note that Fig. 2 is a cross-sectional view including the axis of the second connection joint 35. 2, in this embodiment, the central angle θ1 of the curved pipe portion 36 is approximately 45°. The first connection portion 37 is a socket. The inner diameter of the first connection portion 37 is larger than the inner diameter of the curved pipe portion 36. At the connection portion between the curved pipe portion 36 and the first connection portion 37, a first step portion 39 is formed that protrudes radially inward from the first connection portion 37 and reaches the curved pipe portion 36.

[0022] The second connection portion 38 is a socket. The inner diameter of the second connection portion 38 is larger than the inner diameter of the curved pipe portion 36. At the connection portion between the curved pipe portion 36 and the second connection portion 38, a second step portion 40 is formed that protrudes radially inward from the second connection portion 38 and reaches the curved pipe portion 36. The first connection portion 37 and the second connection portion 38 are provided on both ends of the second connection joint 35. The angle θ2 between the axis O1 of the first connection portion 37 and the axis O2 of the second connection portion 38 is approximately 45° (45°). The angle θ2 between the axis O1 and the axis O2 referred to here means the more acute angle of the angles formed by both the axes O1, O2. It is preferable that the angle θ2 is equal to or smaller than 45°. The lower limit of the angle θ2 is, for example, 1°.

[0023] In a cross section including the axis of the second connection joint 35, the radius of curvature of the inner wall surface 36a on the inner periphery of the curved pipe portion 36 is greater than 64 mm and smaller than 125 mm. In this cross section, the radius of curvature of the outer wall surface 36b on the inner periphery of the curved pipe portion 36 is preferably greater than 64 mm and smaller than 125 mm. 1, the second connection joint 35 is disposed downstream of the eaves gutter 10. Into the first connection portion 37, a second end portion of the call gutter 30 is inserted.

[0024] The downpipe 45 includes a first downpipe 46 and a second downpipe 47. The downpipes 46, 47 are each formed in a straight pipe shape, and have the same outer diameter and inner diameter. The inner diameter of the downpipes 46, 47 is 65 mm or more (nominal diameter of the downpipes 46, 47 is 65 mm or more). The inner diameter of the downpipes 46, 47 is preferably 75 mm or more, more preferably 98 mm or more. The inner diameter of the nominal downpipe 30 is also preferably the same as the inner diameter of the downpipe 45. Note that if the inner diameter of the downpipes 46, 47 is large, there is a risk that the downpipe support will not be able to withstand the weight of the stored water when the siphon phenomenon occurs, so it is preferable that the inner diameter is 160 mm or less. The downpipes 46, 47 each extend along the up-down direction Z. The first downpipe 46 is disposed higher than the second downpipe 47. The upper end of the first downpipe 46 is inserted into the second connection portion 38 of the second connection joint 35. That is, the second connection joint 35 is connected to the upper end of the first downpipe 46 (downpipe 45). The lower pipe 30 is connected to the downpipe 45 via the second connection joint 35. The second connection part 38 and the first downpipe 46 are maintained watertight. The second connection joint 35 connects the nominal downpipe 30 and the first downpipe 46 (downpipe 45).

[0025] The siphon joint 50 is not particularly limited as long as it has a reduced diameter portion. The siphon joint 50 is provided in the downpipe 45. The reduced diameter portion referred to here means a joint having an inner diameter smaller than any of the inner diameters of one or more pipe materials to which the siphon joint 50 is directly connected. For example, as shown in FIG. 3, a siphon joint 50 includes an outer cylindrical portion 51, an inner cylindrical portion 52, a step portion 53, and a reduced diameter portion 54.

[0026] The outer cylinder portion 51 and the inner cylinder portion 52 are each formed in a straight pipe shape. The inner diameter of the outer cylinder portion 51 is equal to the outer diameter of the downpipes 46, 47. The outer diameter of the inner cylinder portion 52 is equal to the inner diameter of the downpipes 46, 47. The inner cylinder portion 52 is disposed coaxially with the outer cylinder portion 51 inside the outer cylinder portion 51. The outer cylinder portion 51 and the inner cylinder portion 52 are each disposed along the up-down direction Z. The step portion 53 is formed in a ring shape. The step portion 53 protrudes radially outward from the upper end of the inner cylindrical portion 52. The step portion 53 is connected to a middle portion of the outer cylindrical portion 51 in the up-down direction Z. The reduced diameter portion 54 is formed in a ring shape, and is fixed onto the step portion 53. The inner diameter of the reduced diameter portion 54 is smaller than the inner diameter of the step portion 53 and the inner diameter of the inner cylindrical portion 52.

[0027] The lower end of the first downpipe 46 is inserted into the upper end of the outer tubular portion 51. The first downpipe 46 and the outer tubular portion 51 are maintained watertight. The upper end of the second downpipe 47 is disposed between the outer tubular portion 51 and the inner tubular portion 52. The outer tubular portion 51, the inner tubular portion 52 and the second downpipe 47 are maintained watertight. As shown in Fig. 1, the length L7 of the downspout 45 located between the second connection joint 35 and the siphon joint 50 is 1 m or more. The length L7 is also the distance between the second connection joint 35 and the siphon joint 50. This length L7 is preferably 1.5 m or more. This length L7 is preferably 4 m or less. This length L7 is more preferably 3 m or less, and most preferably 2.8 m or less. The angle θ4 between the axis O3 of the lower gutter 30 and the axis O4 of the downpipe 45 is 45° or less. The angle θ4 between the axes O3 and O4 means the more acute angle between the axes O3 and O4. For example, the lower limit of the angle θ4 is 1°. For example, the first connection joint 20, the outlet gutter 30, the second connection joint 35, the downspout 45, and the siphon joint 50 are formed by extrusion molding or injection molding a resin such as polyvinyl chloride.

[0028] The lower end of the second downpipe 47 is connected to the ground G. The lower end of the second downpipe 47 is connected to a known water collection basin (drainage mechanism) 205 buried in the ground. The water collection basin 205 is connected to a drainage structure 207 such as a sewer pipe via a connecting pipe 206.

[0029] According to the rain gutter system 1 of this embodiment, rainwater that falls on the roof 201 of the building 200 flows into the eaves gutter 10. The flow path cross-sectional area S of the eaves gutter 10 is 11000 mm 2The inner diameter of the downspout 45 is 65 mm or more. Therefore, the gutter system 1 can be used as a large-scale gutter system for use in a logistics warehouse or the like. Since the siphon joint 50 provided in the downspout 45 has a reduced diameter portion 54, the flow rate of rainwater flowing into the reduced diameter portion 54 is greater than the flow rate of rainwater flowing out from the reduced diameter portion 54 to the downstream side. Therefore, rainwater is likely to accumulate in the reduced diameter portion 54. When rainwater accumulates in the reduced diameter portion 54, the downspout 45 (second downspout 47) arranged downstream of the reduced diameter portion 54 becomes full. Then, the rainwater in the reduced diameter portion 54 is pulled by the rainwater in the downspout 45 arranged downstream of the reduced diameter portion 54, causing a siphon phenomenon, and the rainwater in the downspout system 1 flows vigorously downstream. In this case, the inventors of the present application discovered that by having the length L7 of the downspout 45 located between the second connection joint 35 and the siphon joint 50 be 1 m or more, the siphon effect can be more reliably generated in the siphon joint 50 having the reduced diameter section 54, and the siphon effect generated in the siphon joint 50 can be stably transmitted to the upstream part of the gutter system 1. Therefore, even in a large gutter system 1 equipped with a reduced diameter section 54, the siphoning effect can be more reliably generated, and the generated siphoning effect can be stably transmitted to the upstream portion.

[0030] In addition, rainwater drained from the downspout 45 of the gutter system 1 flows into the drainage structure 207 via the catchment basin 205 and the connecting pipe 206.

[0031] In a cross section including the axis of the second connection joint 35, the radius of curvature of the inner wall surface 36a is greater than 64 mm and smaller than 125 mm. Rainwater that flows into the second connection joint 35 from the first connection portion 37 of the second connection joint 35 does not stagnate on the inner wall surface 36a, and the flow rate of the rainwater is less likely to decrease on the inner wall surface 36a. Therefore, the rainwater that flows into the second connection joint 35 can flow smoothly toward the second connection portion 38 of the second connection joint 35. The angle θ2 between the axis O1 of the first connection portion 37 of the second connection joint 35 and the axis O2 of the second connection portion 38 is 45° or less. Rainwater that flows from the first connection portion 37 of the second connection joint 35 into the second connection joint 35 does not stagnate in the second connection joint 35, and the flow rate of the rainwater is unlikely to decrease in the second connection joint 35. For this reason, the rainwater that flows into the second connection joint 35 can flow smoothly toward the second connection portion 38 of the second connection joint 35.

[0032] The length L6 of the lower gutter 30 is 3 m or less, and the angle θ4 between the axis O3 of the lower gutter 30 and the axis O4 of the downpipe 45 is 45° or less. Therefore, the flow rate of rainwater discharged from the rain gutter system 1 per unit time can be increased.

[0033] In this embodiment, the gutter system 1A may be configured as shown in Fig. 4. The gutter system 1A includes a first connection joint 55 instead of the first connection joint 20 and the call gutter 30 of the gutter system 1 of this embodiment. The first connection joint 55 has a straight pipe section 56 instead of the second connection section 23 of the first connection joint 20. The outer diameter of the straight pipe section 56 is the same as the outer diameter of the nominal gutter 30. As shown by the two-dot chain line in FIG. 4, the straight pipe section 56 is formed to have a sufficiently long length before the gutter system 1A is constructed. In the first connection joint 55, the length of the straight pipe section 56 is adjusted at the construction site or the like when the specifications of the gutter system 1A are determined. Then, the straight pipe section 56 with the adjusted length is inserted into the first connection section 37 of the second connection joint 35.

[0034] The gutter system 1A of the modified example configured in this manner can also achieve the same effects as the gutter system 1A of the present embodiment.

[0035] Second embodiment Next, a second embodiment of the present invention will be described with reference to Fig. 5. The same parts as those in the above embodiment are denoted by the same reference numerals, and their description will be omitted. Only the differences will be described. As shown in Fig. 5, the gutter system 2 of this embodiment includes a downpipe 45A, an increaser (diameter expansion section) 60, and an underground buried pipe 65 instead of the downpipe 45 of the first embodiment. The downpipe 45A includes a third downpipe 48 in addition to the components of the downpipe 45. The third downpipe 48 is disposed below the second downpipe 47. The inner diameter of the third downpipe 48 is larger than the inner diameter of the second downpipe 47.

[0036] The increaser 60 is a so-called diameter expansion joint. For example, the inner diameter of the lower end of the increaser 60 is larger than the inner diameter of the upper end of the increaser 60. The upper end of the increaser 60 is connected to the lower end of the second downpipe 47. The lower end of the increaser 60 is connected to the upper end of the third downpipe 48.

[0037] The underground buried pipe 65 is connected to the lower end of the third downpipe 48 (the downstream end of the downpipe 45A). The underground buried pipe 65 is a pipe buried in the ground. The underground buried pipe 65 includes a first elbow 66, a connecting pipe 67, and a second elbow 68. The connecting pipe 67 is disposed in the ground along a horizontal plane. The first elbow 66 connects the lower end of the third downspout 48 and a first end of the connecting pipe 67. The second elbow 68 is connected to a second end of the connecting pipe 67. The end of the second elbow 68 opposite to the end connected to the connecting pipe 67 faces downward. The second end of the connecting pipe 67 and the second elbow 68 are disposed in a rainwater basin 69 buried in the ground. The increaser 60 is provided in the downspout 45A between the siphon joint 50 and the underground buried pipe 65. A pipe 70 is connected to the rainwater manhole 69.

[0038] In the gutter system 2 configured as described above, even in a large gutter system equipped with a reduced diameter section 54, the siphon effect can be more reliably generated and the generated siphon effect can be stably transmitted to the upstream portion. Furthermore, by creating a negative pressure in the increaser 60, the flow rate of the rainwater in the downpipe 45A upstream of the increaser 60 can be further increased. Therefore, the flow rate of the rainwater flowing through the gutter system 2 can be further increased. The rainwater drained from the downpipe 45A of the rain gutter system 2 flows into a rainwater basin 69 through an underground buried pipe 65. Then, the rainwater is discharged to the outside of the rain gutter system 2 through a pipe 70.

[0039] Although the first and second embodiments of the present invention have been described above in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and the present invention also includes modifications, combinations, deletions, etc. of the configurations within the scope of the gist of the present invention. Furthermore, it goes without saying that the configurations shown in each embodiment can be used in appropriate combinations. The radius of curvature of the inner wall surface of the second connection joint 35 may be 64 mm or less or 125 mm or more in a cross section including the axis of the second connection joint 35. The angle θ2 of the second connection joint may exceed 45°. The downspout 45 has been described as being divided into the first downspout 46, the second downspout 47, etc. However, the downspout may be integrally configured as a single downspout. The angle θ4 between the axis O3 of the lower gutter 30 and the axis O4 of the downpipe 45 may exceed 45°. The gutter systems 1, 2 do not necessarily have to include the first connection joint 20 and the lower gutter 30.

[0040] As in a first modified example shown in Fig. 6, reduced diameter portion 54 of siphon joint 50A may be integral with step portion 53. This siphon joint 50A does not have an inner cylinder portion 52. In other words, siphon joint 50A is formed by outer cylinder portion 51 and step portion 53, and step portion 53 serves as reduced diameter portion 54. In this modified example, step portion 53 (reduced diameter portion 54) is an annular protrusion.

[0041] Here, because rainwater is stored upstream of reduced diameter portion 54 of siphon joint 50A, the load increases due to the stored rainwater. In particular, if downpipe 45 has an inner diameter of 98 mm or more and a thin wall thickness, the downpipe may be damaged by the weight of the stored rainwater. Therefore, if downpipe 45 has an inner diameter of 98 mm or more, the wall thickness of downpipe 45 is preferably at least 3 mm. Here, if the thickness of downspout 45 is 5 mm or less, the inner diameter of the downspout is large and it is difficult for it to reach a full-flow state in which the siphon effect occurs, so it is desirable to increase the protruding height of the reduced diameter portion 54 of siphon fitting 50A to make it easier to store rainwater. Therefore, the protruding height L of the reduced diameter portion 54 from the inner surface of the downspout 47 shown in Fig. 7 is preferably 3.5 mm to 6 mm, more preferably 4.0 mm to 5.5 mm. If the protruding height L is less than 3.5 mm, the large inner diameter may make it difficult for the water to reach a full-flow state and the siphon phenomenon to occur. On the other hand, if the protruding height L is more than 6 mm, the flow rate may decrease.

[0042] On the other hand, when the inner diameter of downspout 45 is 98 mm or more and the wall thickness of downspout 45 is large, the flow rate is likely to decrease although the siphon phenomenon is likely to occur due to the reduced diameter portion 54 due to the small inner diameter. Therefore, when the thickness of the downspout 45 is greater than 6.5 mm, the protruding height L of the reduced diameter portion 54 from the inner surface of the downspout 47 shown in Fig. 7 is preferably 0.4 mm to 2.0 mm, more preferably 0.6 mm to 2.0 mm, and even more preferably 1.1 mm to 2.0 mm. When the protruding height L is less than 0.4 mm, the siphon phenomenon may not easily occur. On the other hand, when the protruding height L is more than 2.0 m, the flow rate may decrease.

[0043] As in a second modified example shown in FIG. 8, in a siphon joint 50B, a junction 57 may be provided downstream of the step 53 (reduced diameter portion 54). As in the first modified example, when the inner diameter of the downpipe is 98 mm or more and the wall thickness of the downpipe is 5 mm or less, the protruding height L of the reduced diameter portion 54 from the inner surface of the downpipe 47 shown in Fig. 9 is preferably 3.5 mm to 6 mm, and more preferably 4.0 mm to 5.5 mm. On the other hand, when the inner diameter of the downpipe is 98 mm or more and the wall thickness of the downpipe is 6.5 mm or more, the protruding height L of the reduced diameter portion 54 is preferably 0.4 mm to 2.0 mm, more preferably 0.6 mm to 2.0 mm, and even more preferably 1.1 mm to 2.0 mm.

[0044] As shown in a third modified example in FIG. 10, a drain joint 700 may be provided that connects the opening 11b (drop opening) of the eaves gutter 10 and the joint 20 according to the embodiment of the present invention. A siphoning member 7 may also be provided in the drain joint 700. This allows a siphoning effect to occur and provides high drainage capacity even when rainwater flows into the eaves gutter during heavy rain. The siphoning member 7 may be an injection molded product made of synthetic resin such as rigid polyvinyl chloride resin, polycarbonate, ABS, or AES. The siphoning member 7 may also be made of cast iron using a mold.

[0045] The siphon generating member 7 may have a water drop opening portion 72, a rib 71, or a cover member 73. The water drop opening portion 72 protrudes downward from the eaves gutter 10. The rib 71 extends upward from the bottom surface 11a of the eaves gutter 10. A plurality of ribs 71 are provided at intervals in the circumferential direction of the water drop opening portion 72. When a cover member 73 is provided, it is supported from below by the plurality of ribs 71. The cover member 73 covers the water drop opening portion 72 from above. In the siphon generating member 7, rainwater flows into the water drop opening portion 72 through a gap between the cover member 73 and the rib 71. The cover member 73 may be provided with a through hole.

[0046] The opening area of ​​the drop opening 72 is 30 cm 2 over 190cm 2 The opening area of ​​the drop opening 72 is 30 cm 2 If the opening area of ​​the drop port 72 is less than 190 cm, there is a risk that the large amount of wastewater generated by the siphon generating member 7 cannot be drained smoothly. 2If it exceeds this value, the fit will become too large, which may result in the drain joint 700 and the supports supporting the eaves gutter 10 becoming larger.

[0047] By setting the position of the cover member 73 of the siphon generating member 7 so that it is 10 to 50 mm above the bottom surface 11a of the eaves gutter 10, the siphon generating member 7 becomes full and water-sealed without sucking in air even when a large amount of rainwater flows in from the opening during heavy rain. Therefore, the siphon phenomenon can be generated at the drop opening 72, resulting in excellent drainage performance.

[0048] (Example) EXAMPLES The present invention will be described in more detail below by specifically showing examples and comparative examples, but the present invention is not limited to the following examples. In the following examples and comparative examples, the flow channel cross-sectional area S of the eaves gutter 10 is 11000 mm 2 The above is set, and the nominal diameter of the downpipe 45 is set to 75 (the inner diameter of the downpipe 45 is set to 78 mm or 84 mm). (Example 1) The length L7 of the downspout 45 located between the second connection joint 35 and the siphon joint 50 was changed as shown in specifications No. 1 to 4 in Table 1. Then, the flow rate of rainwater at the opening 11b (drop outlet) of the eaves gutter 10 was measured.

[0049] [Table 1]

[0050] In Specification No. 1, the length L7 of the downspout 45 was set to 3 m, and the flow rate of rainwater at the opening 11b of the eaves gutter 10 was set to 20 L / s (liters per second). In this case, the siphon phenomenon occurred, so there was no overflow of rainwater from the eaves gutter 10. In Specification No. 2, the length L7 of the downspout 45 was set to 2 m, and the flow rate of rainwater at the opening 11b of the eaves gutter 10 was set to 15 L / s. In this case, the siphon phenomenon occurred, so there was no overflow of rainwater from the eaves gutter 10. In Specification No. 3, the length L7 of the downspout 45 was set to 1.2 m, and the flow rate of rainwater at the opening 11b of the eaves gutter 10 was set to 10 L / s. In this case, the siphon phenomenon occurred, so there was no overflow of rainwater from the eaves gutter 10. In Specification No. 4, the length L7 of the downspout 45 was set to 0.8 m, and the flow rate of rainwater at the opening 11b of the eaves gutter 10 was set to 7 L / s. In this case, the siphon effect was blocked, so rainwater overflowed from the eaves gutter 10. In Example 1, it was found that specifications No. 1 to No. 3 were examples, and specification No. 4 was a comparative example.

[0051] Example 2 As shown in Table 2, the angle θ4 between the axis O3 of the outlet gutter 30 and the axis O4 of the downpipe 45, and the length L6 of the outlet gutter 30 were changed as in specifications No. 6 to 10. Then, the flow rate of rainwater was measured.

[0052] [Table 2]

[0053] In Specification No. 6, the angle θ4 is set to 45°, and the length L6 of the inlet pipe 30 is set to 1 m. In this case, the flow rate of rainwater is 20 L / s. In Specification No. 7, the angle θ4 is set to 25°, and the length L6 of the outlet pipe 30 is set to 1 m. In this case, the flow rate of rainwater is 23 L / s. In Specification No. 8, the angle θ4 is set to 45°, and the length L6 of the outlet pipe 30 is set to 2 m. In this case, the flow rate of rainwater is 12 L / s. In Specification No. 9, the angle θ4 is set to 45°, and the length L6 of the outlet pipe 30 is set to 3 m. In this case, the flow rate of rainwater is 10 L / s. In the specification No. 10, the angle θ4 was set to 45°, and the length L6 of the outlet gutter 30 was set to 4 m. In this case, the flow rate of rainwater was 5 L / s. In Example 2, the siphon phenomenon occurred in specifications No. 6 to No. 10, and rainwater did not overflow from the eaves gutter 10. Therefore, it was found that specifications No. 6 to No. 10 were examples.

[0054] Example 3 The wall thickness of the downspout 45 and the length of the step L of the reduced diameter part of the siphon joint 54 were changed as shown in specifications No. 11 to 19 in Table 3. Then, the occurrence of the siphon phenomenon and the presence or absence of overflow from the eaves gutter 10 upstream of the siphon joint 54 were measured.

[0055] [Table 3]

[0056] In Example 3, the siphon phenomenon occurred in specifications No. 11 to No. 15, and rainwater did not overflow from the eaves gutter 10. On the other hand, specifications 16 and 18 were less likely to cause the siphon phenomenon, and overflow from the eaves gutter 10 occurred. Also, specifications 17 and 19 caused the siphon phenomenon, but the flow rate was low, and overflow from the eaves gutter 10 occurred. For this reason, it was found that specifications No. 11 to No. 15 were examples. [Explanation of symbols]

[0057] 1,1A,2 Gutter system 10 Gutters 30 Call pipe 35 Second connecting joint (connecting joint) 36a Inner wall 45,45A Downpipe 50 Siphon fitting 54 Reduced diameter part 60 Increaser (expanded diameter section) 65 Underground piping L6, L7 length O1,O2,O3,O4 Axis S Flow sectional area θ2, θ4 angle

Claims

1. The system comprises an eaves gutter, a siphon generating unit provided at an opening formed in a bottom surface of the eaves gutter, a call gutter connected to the downstream side of the eaves gutter, and a downspout connected to the downstream side of the call gutter, The siphon generating section includes a drop mouth section, a plurality of ribs provided at intervals in the circumferential direction of the drop mouth section, and a cover member supported from below by the ribs and having a through hole, The call down pipe has a first connection joint at an upstream end and a second connection joint at a downstream end, The length of the said call gutter is 3m or less, The angle between the axis of the downpipe and the axis of the downpipe is 45° or less, The downspout includes a first downspout connected to the second connection joint, a siphon joint having a reduced diameter portion and provided at a lower end of the first downspout, and a second downspout connected to the siphon joint, The inner diameter of the downspout is 98 mm or more, The thickness of the downspout is greater than 6.5 mm, The protruding height of the reduced diameter portion from the inner surface of the first downpipe is 0.4 mm or more and 2.0 mm or less, A gutter system in which the length of the first downspout located between the second connection joint and the siphon joint is 1 m or more (excluding those that include a branch pipe equipped with an induction section that induces the siphon effect at the inlet).

2. The gutter system according to claim 1 , wherein in a cross section including the axis of the first connection joint and the second connection joint, a radius of curvature of an inner wall surface on an inner periphery side of the connection joint is 64 mm or less.

3. The gutter system according to claim 1 or 2, wherein an angle between axes of the connection parts provided at both ends of the connection joint is 45° or less.

4. The gutter system according to claim 1 , wherein the first downspout has a length of 4 m or less.

5. The lower end of the second downspout is connected to a water collection basin buried in the ground, The water collecting basin is provided with a connecting pipe on a side surface, The gutter system according to claim 1 , wherein a lower end of the second downspout is located higher than the connecting pipe.

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